NASA photos appear to show a pyramid-like structure the same size as Giza on Mars, prompting speculation about whether an ...

Ground-penetrating radar reveals a long-lost river system hidden under the surface of Mars. (NASA/JPL/UCLA/UiO/ETH Zurich) ...

Giant, dense structures have been discovered beneath the surface of Mars and they are leaving experts both mystified and excited. The first of these, confirmed by researchers in a fascinating paper, ...

Scientists have long thought there are a series of pyramid-like structures on Mars, with recent images showing one that could ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. NASA has released two new ...

Mars has a clear structure in its mantel, and its crust includes distinct reservoirs, scientists have said. Those are the findings from meteorites that originated 1.3 billion years ago on the red ...

The odd pyramid-like structure found in the largest canyon network in the solar system has sparked theories the Red planet ...